Adjustable chair



FIG. 1 is a perspective view of an adjustable chair showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a perspective view of the adjustable chair where the adjustable chair is in a configuration of use; and,

FIG. 10 is a left side elevational view thereof.

The broken lines in the drawings depict portions of the adjustable chair that form no part of the claimed design. 

CLAIM The ornamental design for an adjustable chair, as shown and described. 